Still can't believe it!

I was spotting on the 4th, the day my period was due. I just assumed AF was here. All day, it never increased and I was so confused! I woke up the next morning to no spotting, and decided to test with the cheapie. Couldn't tell, so got a first response. We are having a baby! My first appointment is Friday, am I'm so nervous and excited! I still feel the urge to keep testing because I have no nausea, and worry about miscarrying. Any advice to calm the nerves?